diff options
Diffstat (limited to 'sys/netinet/ip_fastfwd.c')
-rw-r--r-- | sys/netinet/ip_fastfwd.c | 129 |
1 files changed, 5 insertions, 124 deletions
diff --git a/sys/netinet/ip_fastfwd.c b/sys/netinet/ip_fastfwd.c index 0772cf0..9c3ea66 100644 --- a/sys/netinet/ip_fastfwd.c +++ b/sys/netinet/ip_fastfwd.c @@ -109,12 +109,6 @@ __FBSDID("$FreeBSD$"); #include <machine/in_cksum.h> -static VNET_DEFINE(int, ipfastforward_active); -#define V_ipfastforward_active VNET(ipfastforward_active) - -SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, fastforwarding, CTLFLAG_RW, - &VNET_NAME(ipfastforward_active), 0, "Enable fast IP forwarding"); - static struct sockaddr_in * ip_findroute(struct route *ro, struct in_addr dest, struct mbuf *m) { @@ -159,7 +153,7 @@ ip_findroute(struct route *ro, struct in_addr dest, struct mbuf *m) * to ip_input for full processing. */ struct mbuf * -ip_fastforward(struct mbuf *m) +ip_tryforward(struct mbuf *m) { struct ip *ip; struct mbuf *m0 = NULL; @@ -167,119 +161,20 @@ ip_fastforward(struct mbuf *m) struct sockaddr_in *dst = NULL; struct ifnet *ifp; struct in_addr odest, dest; - uint16_t sum, ip_len, ip_off; + uint16_t ip_len, ip_off; int error = 0; - int hlen, mtu; + int mtu; struct m_tag *fwd_tag = NULL; /* * Are we active and forwarding packets? */ - if (!V_ipfastforward_active || !V_ipforwarding) - return m; M_ASSERTVALID(m); M_ASSERTPKTHDR(m); bzero(&ro, sizeof(ro)); - /* - * Step 1: check for packet drop conditions (and sanity checks) - */ - - /* - * Is entire packet big enough? - */ - if (m->m_pkthdr.len < sizeof(struct ip)) { - IPSTAT_INC(ips_tooshort); - goto drop; - } - - /* - * Is first mbuf large enough for ip header and is header present? - */ - if (m->m_len < sizeof (struct ip) && - (m = m_pullup(m, sizeof (struct ip))) == NULL) { - IPSTAT_INC(ips_toosmall); - return NULL; /* mbuf already free'd */ - } - - ip = mtod(m, struct ip *); - - /* - * Is it IPv4? - */ - if (ip->ip_v != IPVERSION) { - IPSTAT_INC(ips_badvers); - goto drop; - } - - /* - * Is IP header length correct and is it in first mbuf? - */ - hlen = ip->ip_hl << 2; - if (hlen < sizeof(struct ip)) { /* minimum header length */ - IPSTAT_INC(ips_badhlen); - goto drop; - } - if (hlen > m->m_len) { - if ((m = m_pullup(m, hlen)) == NULL) { - IPSTAT_INC(ips_badhlen); - return NULL; /* mbuf already free'd */ - } - ip = mtod(m, struct ip *); - } - - /* - * Checksum correct? - */ - if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) - sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); - else { - if (hlen == sizeof(struct ip)) - sum = in_cksum_hdr(ip); - else - sum = in_cksum(m, hlen); - } - if (sum) { - IPSTAT_INC(ips_badsum); - goto drop; - } - - /* - * Remember that we have checked the IP header and found it valid. - */ - m->m_pkthdr.csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID); - - ip_len = ntohs(ip->ip_len); - - /* - * Is IP length longer than packet we have got? - */ - if (m->m_pkthdr.len < ip_len) { - IPSTAT_INC(ips_tooshort); - goto drop; - } - - /* - * Is packet longer than IP header tells us? If yes, truncate packet. - */ - if (m->m_pkthdr.len > ip_len) { - if (m->m_len == m->m_pkthdr.len) { - m->m_len = ip_len; - m->m_pkthdr.len = ip_len; - } else - m_adj(m, ip_len - m->m_pkthdr.len); - } - - /* - * Is packet from or to 127/8? - */ - if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || - (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { - IPSTAT_INC(ips_badaddr); - goto drop; - } #ifdef ALTQ /* @@ -290,12 +185,10 @@ ip_fastforward(struct mbuf *m) #endif /* - * Step 2: fallback conditions to normal ip_input path processing - */ - - /* * Only IP packets without options */ + ip = mtod(m, struct ip *); + if (ip->ip_hl != (sizeof(struct ip) >> 2)) { if (V_ip_doopts == 1) return m; @@ -496,18 +389,6 @@ passout: goto consumed; } -#ifndef ALTQ - /* - * Check if there is enough space in the interface queue - */ - if ((ifp->if_snd.ifq_len + ip_len / ifp->if_mtu + 1) >= - ifp->if_snd.ifq_maxlen) { - IPSTAT_INC(ips_odropped); - /* would send source quench here but that is depreciated */ - goto drop; - } -#endif - /* * Check if media link state of interface is not down */ |